高等学校化学学报

高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (5): 1049.

• 研究论文 • 上一篇    下一篇

钙钛矿型锰氧化物La1-x-yCaxKyMnO3系列样品的介电性质

杨铭, 黄科科, 侯长民, 刘宪瑞, 胡滨, 袁宏明, 冯守华   

  1. 吉林大学无机合成与制备化学国家重点实验室,  化学学院, 长春 130012
  • 收稿日期:2010-08-17 修回日期:2010-11-30 出版日期:2011-05-10 发布日期:2011-04-11
  • 通讯作者: 冯守华 E-mail:shfeng@jlu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:  20631010,  90922034)资助.

Dielectric Properties of a Series  of  Perovskite La1-x-yCaxKyMnO3 Manganites

  • Received:2010-08-17 Revised:2010-11-30 Online:2011-05-10 Published:2011-04-11
  • Contact: Shou-Hua FENG E-mail:shfeng@jlu.edu.cn
  • Supported by:

    国家自然科学基金(批准号:  20631010,  90922034)资助.

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摘要： 应用水热氧化还原反应制备的La1-x-yCaxKyMnO3系列样品具有ABO3型钙钛矿结构，并且在A位同时拥有La3+，Ca2+和K+三种不同价态的阳离子。将La1-x-yCaxKyMnO3系列样品研磨压片，经烧结制成平行板电容器，在室温条件下，测试样品的电容、介电损耗和电阻随频率的变化。我们结合样品组成引起的A位离子失配度的变化，给出了La1-x-yCaxKyMnO3系列样品介电常数实部随A位离子变化的规律；对比样品电阻随频率变化的理论值和计算值说明样品内部属于电阻电容并联电路。

关键词: 钙钛矿, 介电常数, A位离子失配度

Abstract: A series of perovskite manganese oxides La1-x-yCaxKyMnO3 are synthesized from hydrothermal redox reaction, and they have La3+, Ca2+ and K+ three kinds of cations with different valences occupied at A site. The obtained samples are ground and pressed in discs, and the discs are then sintered to form a parallel-plate capacitor. At room temperature, the capacitance, the loss tangent and the resistance are measured as a function of frequency. We find that the real part of the complex relative dielectric permittivity varies considerably in different samples with the A-site cation size mismatch. The comparison of the resistance derived from experiment and calculation respectively indicates the equivalent circuit in intrinsic samples.

Key words: Perovskite, Dielectric constant, A-site cation size mismatch

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